单项选择题

The stone chip is thought to be the most important tool because it______.

A．was one of the first tools.
B．developed human capabilities.
C．led to the invention of machines.
D．was crucial to the development of mankind.
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单项选择题
If customers are returning shirts because of crooked collars, the people most likely to identify the cause of the problem are______.
A．the salesmen.
B．the supervisors.
C．top management.
D．the people who make the shirts.
单项选择题
The author's chief purpose is______.
A．to inform us that people are dissatisfied with their wages and hours.
B．to explain that "job enrichment" creates job.
C．to suggest that bosses hinder production more than they help it.
D．to persuade us to carry out our greater" job simplification".
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